Translations:Rust installation special notes in China/1/en

Why?
Generally speaking, there's some strict auditing of Internet traffic in China, both on the content providers' side and service providers' side. None of Rust's major hosting services(rust-lang.org, crates.io, docs.rs, etc) can be classified as trusted here, since there isn't a representative legal body (like a company) participating the audition. These services are not banned either, since they're mostly technical content instead of arbitrary content (like what Google provides). So the actual use experiences will actually vary according to the ISPs in use. If you're working inside technical oriented offices, these services will generally work ok, but there could be connectivity issues now and then. If you're working from home, there's a chance that these services are almost entirely unusable.